Just an update.  I have narrowed it down that it's the Deco's.  I can get 1GB speeds going down, but I cannot get them as an upload; I only get approximately 300mbps.  If I connect an old router (and I mean early 2000's) in AP mode and bypass the deco then I'm back to 1GB speeds up and down.  I'm really hoping someone can assist.  I love TP Link's QoS & parental controls.

  @Land_Of_Oz I think it's good that you've noted the Hardware Version number.  The only thing I can think of is to make sure each unit has the correct firmware based on that Version #, maybe go through them and try to manually install the appropriate version.  (Both V2 and V1 latest is 1.6.3 BUT they are different size by .01 MB, leading me to believe that it is important to match HW version with Firmware versions).

I recently downloaded a firmware for my lone BE95, which was listed on the Version 1.6 page, but when I opened the .zip it actually notes "V2".  So far it appears to be working correctly and they haven't created a V2 tab, but I see others with different Firmware versions (different Deco model) for the same hardware version and it concerns me...

  @Land_Of_Oz 

I'm having issues with Google Fiber too. My M9Plus works fine with my old Spectrum account but indicates there is no internet connection with google fiber. Mine is HW version 1 but with the same firmware version. The router gets an IP address and DNS from google almost instantly but will not connect 95 times out of 100. The fact that is connects once in a while is mind boggling, so why not connect all of the time. And of course google says to use their Nest Pro router, which btw does work. But I have about 30 Kasa/Tapo devices that work well and respond fairly quick with the Deco M9Plus and that also need reserved IPs for my Hubitat hub. But the google router doesn't provide any method to reserve IPs.